Stereopticon slide



July 18, 1939. M. BANNER STEREOPTICON SLIDE FiledF 7 /Z "Jr5 /5 IN VENTOR Patented July 1s, 1939 UNITED STATES PATENT oFFlcE 5 Claims.

My invention relates to stereopticon slides.

The object of my invention is to provide a stereopticon slide comprisinga rotatable disc of glass or other suitable transparent material onwhich is printed opaque characters such as letters, 1"1gures or symbolsarranged in a circle; and mounted in a frame of glass, the arrangementbeing such that light rays may be projected thru the disc and liframewhich supports the disc in the act of projecting the characters on ascreen.

- A further feature oi my invention is the use of a stationary pointerto identify the nearest character thereto when the disc is in a positionof rest.

My device may be used for playing games and is adapted for use in movingpicture theatres.

For instance. it may be intended to give a free 4 ticket to the holderof a lucky number such number to be determined by operation of thedevice, aiter giving patrons of the theatre cards with niunbers printedthereon, each card having a different number. f

By determining the winning number before the audience by use of thedevice. no question can be raised as to the right winner.

' The device is adapted to be placed in the usual slide holder of astereopticon and all of the characters are projected on the screensimultaneously.

It has been customary to make slides of this character with a stationaryd isc or dial and a rotating pointer to indicate a'character on the dialwhen it is in a position of rest.

Such a construction requires a counterbalance for the pointer to insureits even movement in spinning. and often the counterbalance extends in aline with the pointer directly across the dial so that to a person withpoor sight, either end might appear as the pointer end. thus causingconfusion as to number selected.

By rotating the dial instead of the pointer, no one is misled as to thenumber resting nearest to the pointers end, andthe dial may be perfectlybalanced without dimculty.

Referring to the drawing which forms a part of this specification,

Fig. 1 is a face view of the slide, part of the iront glass plate beingremoved to disclose the arrangement of the glass dials or discs mountedin the frame.

Fig. 1A is a front elevational view of the dial portion and pointer.

Fig. 2 is a perspective view of the frame and disc portions shown inseparated relation.

Fig. 3 is a vertical sectional side view looking in the directionindicated by the arrows in Fig, 1.

Fig. 4 is a vertical sectional side view of the pivotal portions shownin assembled relation.

Fig. 5 is a side view of the pivotal bearings comprising theirrespective anges byl means of which the discs are supported in operativeposition by 5 the frame portion of the device.

I0 indicates the front plate which serves as the supporting element forthe dial and disc portions I I and I2 respectively, and I3 indicates anopaque frame which braces the front plate and renders 10 its portionsoutside of the circle I4 impervious to light rays.

The plate I3 is cemented to the front plate and the discs II and I2 areheld together at their outer edges by a cylindrical ring of thin metalI5 15 which is spun over their outer edges as illustrated.

The front plate I0 is provided with an aperture I6 in which is closelytted a cylindrical bushing Il having a. flange I1 which rests againstits outer surface as illustrated.

A pointer I8 is suspended :from the cylinder Il and rests against therear side of the plate I0, and a cylindrical plug I9 ilts in the bushingIl with its flange I9' pressed against the-pointer to hold it in rmrelation with the plate l0.

Formed integral with the plug I9 is a cylindrical bearing 20 on which ismounted the hub portions comprising the cylinder 2| with its flange 2land cylinder 22 with its ange portion 22' and washer 23.

The disc'l2 and dial II are each provided with an aperture I2 and IIrespectively, thru which the cylinder 2| projects, the disc and dialbeing heldvrmly between the flanges 2| and 22 while the cylinders 2| and22 are fitted in close frictional relation and are freely rotatable onthe bearing 20 between the ilange I9 and the washer 23 secured to theouter end of the plug I9 on the extension 2l. 40

Iii/will be understood that the disc and dial are made of thin glass andthat the parts comprising the frame are very narrow to permit the slideas a whole to t within the standard holder forming a part of theprojection apparatus.

The opaque portion of the frame indicated by I3 is formed with anopening in its top to pro'l vide a space I3' to permit the dial and discto extend above the frame so that the dial may be manually rotated, andalso that the characters carried by the dial are located between thedisc and dial plate where they are protected from contact with the handin handling the slide and from abrasion in operation and in shippingetc.

The hand of the pointer is made very thin so 2 that no shadow will becest on the dial and magniiied on the screen in the act of using thedevice.

Itwillalsobenotedthatbyreasonoithe pointer being stationary. it need notnecessarily be suspended from the hub of the wheel but could.v

be placed in any desired position on the inner or outer side of theiront plate il so long as the pointer intersects the circular line oftravel of the dial to indicate a character when the .dial is at i1 orthe parts being made of durable material insures good service.

Having thus described-my invention I claim as new:

l. A stereopticon slide of the character described comprising an opaqueframe formed with a circular opening which extends thru the upper sideof the frame, a plate of transparent material carried by said frame,means carried by `said plate for supporting a pair of discs, a pair oidiscs rotatably mounted on said means one of` the upper side oi materiallocated in and extending thru the upper side oi' said opening one otwhich comprises a dial and each o! which is provided with a centralaperture, and means carried by said Plate and extending thru saidapertures to support said discs in rotatable relation.

3. The construction dened in claim 2, together with; and a metal bandencircling the periphery of said discs.

4. A stereopticon slide of the character described comprising an opaqueframe formed with a central opening which extends thru the upper sidethereof, a plate of transparent material extending over the face o! theframe and secured thereto. a pair of transparent discs rotatably mountedin said opening in the frame and extending thereabove one of whichcomprises a dial lo' cated between them, means for holding said discs inclose contact with each other, and a stationary pointer located adjacentthe dial to indicate a symbol thereof when the dial is at rest.

5. A stereopticon slide of the character described comprising an opaqueframe formed with a circular opening which extends thru the upper sideof the frame, a plate oi transparent material carried by the frame,means carried by said plate for supporting a pair oi' discs extendingabove the frame and a pair of discs rotatably mounted on said means oneof which discs comprises a dial located between them, means for holdingsaid discs together to insure their rotation in unison, andA means forindicating a character on the dial when it is at rest.

MURRAY BANNER.

